Average speed is presently the default and only comparator for Matched Rides. I have moved on from Average Speed in terms of which metric i pay attention to the most. On my bike computer (Wahoo) I have Cadence set as the primary metric, and it would be nice if I could compare my Average Cadence for Matched Rides instead of Average Speed. Other athletes may have Power their preference, or Heart Rate.
One way to achieve this would be to just put a drop-down menu on the Matched Rides page and let the user change it, but of course it would also be great if I could set this as the default in Settings for all Matched Ride comparisons/graphs.
Considerations would need to be made for rides which don't have this data, so the Matched Rides feature would need to be extended to display a count ("24/132 Matched Rides shown") and/or warning ("! Not all matched rides have cadence data. Viewing a subset of Matched Rides.")